## anonymous one year ago Estimate the area of the circle, use 22/7 for π

1. anonymous

2. Sachintha

Use the equation $2\pi r^2$

3. anonymous

Area of a circle is $\large A=\pi \times r^{2}$ Right now we have the diameter, which is 28. To get the radius, we have to divide the diameter by 2. So $\large \frac{28}{2}=r$ Once you get the r tell me and we'll plug it into the area of a circle formula :)

4. anonymous

@Sachintha it looks like you combined the circumference formula and area formula together.

5. Sachintha

Sorry my mistake.. :D

6. anonymous

So 28 / 2 = 14

7. Sachintha

8. anonymous

Right. And since we're using 22/7 for pi, it would look like this $\large A=\frac{22}{7} \times 14^{2}$ The next step is to find 14^2

9. anonymous

Its 196?

10. anonymous

Yep that would be it, good job :). So now we are gonna multiply 196 by 22/7. Which will look like this $\large A=\frac{22*196}{7}$ So our next step is to find 196*22

11. anonymous

That would be 4,312

12. anonymous

Right, good job. Now we have to divide 4312 by 7. Which will look like this $\large A=\frac{4312}{7}$ This is gonna be our final step :)

13. anonymous

616?

14. anonymous

Yep, that would be our answer, so $\large A=616$ or more specifically $\large A=616cm^{2}$

15. anonymous

Thank you so much !!!!!! c:

16. anonymous

$\huge \color{aqua}N\color{fuchsia}o \space \color{lime}P \color{orange}r \color{blue}o \color{maroon}b \color{red}l \color{olive}e \color{purple}m \ddot\smile$